I don’t really know what I’m doing so it’s taken me a lot of fiddling to get it going. I finally have my featured products loop working, but only after I changed the 'meta_key' => '_featured' — note the underscore there.

This problem might exist in WooStore as well, but I thought I’d reply to this topic in public in case someone wonders why Mike’s snippet isn’t working. Consider it a 2c refund :-b